Switch Windows Memory RSS to Private Working Set

[dbwiddis]

Fixes #372. Fixes #258

[coveralls]

Coverage remained the same at 92.517% when pulling 92b1430 on dbwiddis:master into 9152ddc on oshi:master.

[codecov-io]

Codecov Report

Merging #478 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #478   +/-   ##
=========================================
  Coverage     84.82%   84.82%           
  Complexity      192      192           
=========================================
  Files            27       27           
  Lines          1364     1364           
  Branches        198      198           
=========================================
  Hits           1157     1157           
  Misses           89       89           
  Partials        118      118

Impacted Files	Coverage Δ	Complexity Δ
...src/main/java/oshi/json/software/os/OSProcess.java	79.83% <ø> (ø)	45 <0> (ø)	⬇️
...core/src/main/java/oshi/software/os/OSProcess.java	100% <ø> (ø)	0 <0> (ø)	⬇️

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